Question
Explain innate immunity
✓
Answer
→Innate immunity is non-specific immunity, which is present at the time of birth.
1) Physical barrier :
→Our skin is the main physical barrier that prevents the entry of microorganisms.
→Mucous membrane lining the respiratory tract, gastrointestinal tract and urinary tract also helps to prevent germs from entering the body.
2) Physiological barrier:
→Acid in the stomach, saliva in the mouth, tears in the eyes etc. inhibit the growth of pathogens.
3) Cellular Barrier :
→Some white blood cells [WBCs] in our body, such as polymorphonuclear leukocytes and natural killer cells, a type of lymphoid cell in the blood, can feed on and destroy microbes.
(4)Cytokine barrier:
→Virus-infected cells secrete proteins called interferons, which protect other uninfected cells from virus infection.
1) Physical barrier :
→Our skin is the main physical barrier that prevents the entry of microorganisms.
→Mucous membrane lining the respiratory tract, gastrointestinal tract and urinary tract also helps to prevent germs from entering the body.
2) Physiological barrier:
→Acid in the stomach, saliva in the mouth, tears in the eyes etc. inhibit the growth of pathogens.
3) Cellular Barrier :
→Some white blood cells [WBCs] in our body, such as polymorphonuclear leukocytes and natural killer cells, a type of lymphoid cell in the blood, can feed on and destroy microbes.
(4)Cytokine barrier:
→Virus-infected cells secrete proteins called interferons, which protect other uninfected cells from virus infection.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?
A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
- Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
- State any two reasons responsible for the cause of infertility.
- Suggest a technique that can help the couple to have a child where the problem is with the male partner.
Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment
In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these F1 plants got both red and white flowered plants in 3 : 1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.
Mention the three connotations of the theory of special creation.
What are carcinogens? Describe their categories.
While creation and presence of variation are directionless, natural selection is directional as it is in the context of adaptation. Comment.
What are the limitations of ecological pyramids?
Differentiate the following and give examples of each: Innate and acquired immunity
The following is the flow chart highlighting the steps in DNA fingerprinting technique. Identify a, b, c, d, e and f.
